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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd95ed0d02f879d4f5f1a7d3df51114c6eea4d00ea1b725e41bd0fe9503f83f8' 
  AND token = 'OcR7XCgFX+EUr63+WTafk/BAlRAU8fJgawXlnPGw/00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}